*: support select/ explain select using bind info

bindinfo/bind.go

@@ -0,0 +1,107 @@
+// Copyright 2019 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bindinfo
+
+import "github.com/pingcap/parser/ast"
+
+// BindHint will add hints for originStmt according to hintedStmt' hints.
+func BindHint(originStmt, hintedStmt ast.StmtNode) ast.StmtNode {
+	switch x := originStmt.(type) {
+	case *ast.SelectStmt:
+		return selectBind(x, hintedStmt.(*ast.SelectStmt))
+	default:
+		return originStmt
+	}
+}
+
+func selectBind(originalNode, hintedNode *ast.SelectStmt) *ast.SelectStmt {
+	if hintedNode.TableHints != nil {
+		originalNode.TableHints = hintedNode.TableHints
+	}
+	if originalNode.From != nil {
+		originalNode.From.TableRefs = resultSetNodeBind(originalNode.From.TableRefs, hintedNode.From.TableRefs).(*ast.Join)
+	}
+	if originalNode.Where != nil {
+		originalNode.Where = selectionBind(originalNode.Where, hintedNode.Where).(ast.ExprNode)
+	}
+	return originalNode
+}
+
+func selectionBind(where ast.ExprNode, hintedWhere ast.ExprNode) ast.ExprNode {
+	switch v := where.(type) {
+	case *ast.SubqueryExpr:
+		if v.Query != nil {
+			v.Query = resultSetNodeBind(v.Query, hintedWhere.(*ast.SubqueryExpr).Query)
+		}
+	case *ast.ExistsSubqueryExpr:
+		if v.Sel != nil {
+			v.Sel.(*ast.SubqueryExpr).Query = resultSetNodeBind(v.Sel.(*ast.SubqueryExpr).Query, hintedWhere.(*ast.ExistsSubqueryExpr).Sel.(*ast.SubqueryExpr).Query)
+		}
+	case *ast.PatternInExpr:
+		if v.Sel != nil {
+			v.Sel.(*ast.SubqueryExpr).Query = resultSetNodeBind(v.Sel.(*ast.SubqueryExpr).Query, hintedWhere.(*ast.PatternInExpr).Sel.(*ast.SubqueryExpr).Query)
+		}
+	}
+	return where
+}
+
+func resultSetNodeBind(originalNode, hintedNode ast.ResultSetNode) ast.ResultSetNode {
+	switch x := originalNode.(type) {
+	case *ast.Join:
+		return joinBind(x, hintedNode.(*ast.Join))
+	case *ast.TableSource:
+		ts, _ := hintedNode.(*ast.TableSource)
+		switch v := x.Source.(type) {
+		case *ast.SelectStmt:
+			x.Source = selectBind(v, ts.Source.(*ast.SelectStmt))
+		case *ast.UnionStmt:
+			x.Source = unionSelectBind(v, hintedNode.(*ast.TableSource).Source.(*ast.UnionStmt))
+		case *ast.TableName:
+			x.Source = dataSourceBind(v, ts.Source.(*ast.TableName))
+		}
+		return x
+	case *ast.SelectStmt:
+		return selectBind(x, hintedNode.(*ast.SelectStmt))
+	case *ast.UnionStmt:
+		return unionSelectBind(x, hintedNode.(*ast.UnionStmt))
+	default:
+		return x
+	}
+}
+
+func dataSourceBind(originalNode, hintedNode *ast.TableName) *ast.TableName {
+	originalNode.IndexHints = hintedNode.IndexHints
+	return originalNode
+}
+
+func joinBind(originalNode, hintedNode *ast.Join) *ast.Join {
+	if originalNode.Left != nil {
+		originalNode.Left = resultSetNodeBind(originalNode.Left, hintedNode.Left)
+	}
+
+	if hintedNode.Right != nil {
+		originalNode.Right = resultSetNodeBind(originalNode.Right, hintedNode.Right)
+	}
+
+	return originalNode
+}
+
+func unionSelectBind(originalNode, hintedNode *ast.UnionStmt) ast.ResultSetNode {
+	selects := originalNode.SelectList.Selects
+	for i := len(selects) - 1; i >= 0; i-- {
+		originalNode.SelectList.Selects[i] = selectBind(selects[i], hintedNode.SelectList.Selects[i])
+	}
+
+	return originalNode
+}

bindinfo/bind_test.go

@@ -280,3 +280,147 @@ func (s *testSuite) TestSessionBinding(c *C) {
 	c.Check(bindData.OriginalSQL, Equals, "select * from t where i > ?")
 	c.Check(bindData.Status, Equals, "deleted")
 }
+
+func (s *testSuite) TestGlobalAndSessionBindingBothExist(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	s.cleanBindingEnv(tk)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t1")
+	tk.MustExec("drop table if exists t2")
+	tk.MustExec("create table t1(id int)")
+	tk.MustExec("create table t2(id int)")
+
+	tk.MustQuery("explain SELECT * from t1,t2 where t1.id = t2.id").Check(testkit.Rows(
+		"HashLeftJoin_8 12487.50 root inner join, inner:TableReader_15, equal:[eq(test.t1.id, test.t2.id)]",
+		"├─TableReader_12 9990.00 root data:Selection_11",
+		"│ └─Selection_11 9990.00 cop not(isnull(test.t1.id))",
+		"│   └─TableScan_10 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
+		"└─TableReader_15 9990.00 root data:Selection_14",
+		"  └─Selection_14 9990.00 cop not(isnull(test.t2.id))",
+		"    └─TableScan_13 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
+	))
+
+	tk.MustQuery("explain SELECT  /*+ TIDB_SMJ(t1, t2) */  * from t1,t2 where t1.id = t2.id").Check(testkit.Rows(
+		"MergeJoin_7 12487.50 root inner join, left key:test.t1.id, right key:test.t2.id",
+		"├─Sort_11 9990.00 root test.t1.id:asc",
+		"│ └─TableReader_10 9990.00 root data:Selection_9",
+		"│   └─Selection_9 9990.00 cop not(isnull(test.t1.id))",
+		"│     └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
+		"└─Sort_15 9990.00 root test.t2.id:asc",
+		"  └─TableReader_14 9990.00 root data:Selection_13",
+		"    └─Selection_13 9990.00 cop not(isnull(test.t2.id))",
+		"      └─TableScan_12 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
+	))
+
+	tk.MustExec("create global binding for SELECT * from t1,t2 where t1.id = t2.id using SELECT  /*+ TIDB_SMJ(t1, t2) */  * from t1,t2 where t1.id = t2.id")
+
+	tk.MustQuery("explain SELECT * from t1,t2 where t1.id = t2.id").Check(testkit.Rows(
+		"MergeJoin_7 12487.50 root inner join, left key:test.t1.id, right key:test.t2.id",
+		"├─Sort_11 9990.00 root test.t1.id:asc",
+		"│ └─TableReader_10 9990.00 root data:Selection_9",
+		"│   └─Selection_9 9990.00 cop not(isnull(test.t1.id))",
+		"│     └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
+		"└─Sort_15 9990.00 root test.t2.id:asc",
+		"  └─TableReader_14 9990.00 root data:Selection_13",
+		"    └─Selection_13 9990.00 cop not(isnull(test.t2.id))",
+		"      └─TableScan_12 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
+	))
+
+	tk.MustExec("drop global binding for SELECT * from t1,t2 where t1.id = t2.id")
+
+	tk.MustQuery("explain SELECT * from t1,t2 where t1.id = t2.id").Check(testkit.Rows(
+		"HashLeftJoin_8 12487.50 root inner join, inner:TableReader_15, equal:[eq(test.t1.id, test.t2.id)]",
+		"├─TableReader_12 9990.00 root data:Selection_11",
+		"│ └─Selection_11 9990.00 cop not(isnull(test.t1.id))",
+		"│   └─TableScan_10 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
+		"└─TableReader_15 9990.00 root data:Selection_14",
+		"  └─Selection_14 9990.00 cop not(isnull(test.t2.id))",
+		"    └─TableScan_13 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
+	))
+}
+
+func (s *testSuite) TestExplain(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	s.cleanBindingEnv(tk)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t1")
+	tk.MustExec("drop table if exists t2")
+	tk.MustExec("create table t1(id int)")
+	tk.MustExec("create table t2(id int)")
+
+	tk.MustQuery("explain SELECT * from t1,t2 where t1.id = t2.id").Check(testkit.Rows(
+		"HashLeftJoin_8 12487.50 root inner join, inner:TableReader_15, equal:[eq(test.t1.id, test.t2.id)]",
+		"├─TableReader_12 9990.00 root data:Selection_11",
+		"│ └─Selection_11 9990.00 cop not(isnull(test.t1.id))",
+		"│   └─TableScan_10 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
+		"└─TableReader_15 9990.00 root data:Selection_14",
+		"  └─Selection_14 9990.00 cop not(isnull(test.t2.id))",
+		"    └─TableScan_13 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
+	))
+
+	tk.MustQuery("explain SELECT  /*+ TIDB_SMJ(t1, t2) */  * from t1,t2 where t1.id = t2.id").Check(testkit.Rows(
+		"MergeJoin_7 12487.50 root inner join, left key:test.t1.id, right key:test.t2.id",
+		"├─Sort_11 9990.00 root test.t1.id:asc",
+		"│ └─TableReader_10 9990.00 root data:Selection_9",
+		"│   └─Selection_9 9990.00 cop not(isnull(test.t1.id))",
+		"│     └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
+		"└─Sort_15 9990.00 root test.t2.id:asc",
+		"  └─TableReader_14 9990.00 root data:Selection_13",
+		"    └─Selection_13 9990.00 cop not(isnull(test.t2.id))",
+		"      └─TableScan_12 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
+	))
+
+	tk.MustExec("create global binding for SELECT * from t1,t2 where t1.id = t2.id using SELECT  /*+ TIDB_SMJ(t1, t2) */  * from t1,t2 where t1.id = t2.id")
+
+	tk.MustQuery("explain SELECT * from t1,t2 where t1.id = t2.id").Check(testkit.Rows(
+		"MergeJoin_7 12487.50 root inner join, left key:test.t1.id, right key:test.t2.id",
+		"├─Sort_11 9990.00 root test.t1.id:asc",
+		"│ └─TableReader_10 9990.00 root data:Selection_9",
+		"│   └─Selection_9 9990.00 cop not(isnull(test.t1.id))",
+		"│     └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo",
+		"└─Sort_15 9990.00 root test.t2.id:asc",
+		"  └─TableReader_14 9990.00 root data:Selection_13",
+		"    └─Selection_13 9990.00 cop not(isnull(test.t2.id))",
+		"      └─TableScan_12 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo",
+	))
+
+	tk.MustExec("drop global binding for SELECT * from t1,t2 where t1.id = t2.id")
+}
+
+func (s *testSuite) TestErrorBind(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	s.cleanBindingEnv(tk)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("drop table if exists t1")
+	tk.MustExec("create table t(i int, s varchar(20))")
+	tk.MustExec("create table t1(i int, s varchar(20))")
+	tk.MustExec("create index index_t on t(i,s)")
+
+	_, err := tk.Exec("create global binding for select * from t where i>100 using select * from t use index(index_t) where i>100")
+	c.Assert(err, IsNil, Commentf("err %v", err))
+
+	bindData := s.domain.BindHandle().GetBindRecord("select * from t where i > ?", "test")
+	c.Check(bindData, NotNil)
+	c.Check(bindData.OriginalSQL, Equals, "select * from t where i > ?")
+	c.Check(bindData.BindSQL, Equals, "select * from t use index(index_t) where i>100")
+	c.Check(bindData.Db, Equals, "test")
+	c.Check(bindData.Status, Equals, "using")
+	c.Check(bindData.Charset, NotNil)
+	c.Check(bindData.Collation, NotNil)
+	c.Check(bindData.CreateTime, NotNil)
+	c.Check(bindData.UpdateTime, NotNil)
+
+	tk.MustExec("drop index index_t on t")
+	_, err = tk.Exec("select * from t where i > 10")
+	c.Check(err, IsNil)
+
+	s.domain.BindHandle().HandleDropBindRecord()
+
+	rs, err := tk.Exec("show global bindings")
+	c.Assert(err, IsNil)
+	chk := rs.NewRecordBatch()
+	err = rs.Next(context.TODO(), chk)
+	c.Check(err, IsNil)
+	c.Check(chk.NumRows(), Equals, 0)
+}

bindinfo/cache.go

@@ -20,16 +20,18 @@ import (
 )
 
 const (
-	// using is the bind info's in use status.
-	using = "using"
+	// Using is the bind info's in use status.
+	Using = "using"
 	// deleted is the bind info's deleted status.
 	deleted = "deleted"
+	// Invalid is the bind info's invalid status.
+	Invalid = "invalid"
 )
 
 // BindMeta stores the basic bind info and bindSql astNode.
 type BindMeta struct {
 	*BindRecord
-	ast ast.StmtNode //ast will be used to do query sql bind check
+	Ast ast.StmtNode //ast will be used to do query sql bind check
 }
 
 // cache is a k-v map, key is original sql, value is a slice of BindMeta.